No documentation

# File actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb, line 124def write_asset_file_contents(joined_asset_path,asset_paths)FileUtils.mkdir_p(File.dirname(joined_asset_path))File.atomic_write(joined_asset_path){|cache|cache.write(join_asset_file_contents(asset_paths))}# Set mtime to the latest of the combined files to allow for# consistent ETag without a shared filesystem.mt=asset_paths.map{|p|File.mtime(asset_file_path!(p))}.maxFile.utime(mt,mt,joined_asset_path)end